arm64: zynqmp: Describe bus-width for SD card on KV260

SD card is connected with 4 data lines which should be described properly.
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/b4046d2f593047400c190e438fd9d05128c293d9.1683034376.git.michal.simek@amd.com

arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso

@@ -135,6 +135,7 @@ &sdhci1 { /* on CC with tuned parameters */
 	disable-wp;
 	xlnx,mio-bank = <1>;
 	assigned-clock-rates = <187498123>;
+	bus-width = <4>;
 };
 
 &gem3 { /* required by spec */

arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso

@@ -118,6 +118,7 @@ &sdhci1 { /* on CC with tuned parameters */
 	clk-phase-uhs-sdr25 = <120>, <60>;
 	clk-phase-uhs-ddr50 = <126>, <48>;
 	assigned-clock-rates = <187498123>;
+	bus-width = <4>;
 };
 
 &gem3 { /* required by spec */